package com.swpu.filter;

import com.alibaba.fastjson.JSON;
import com.swpu.common.BaseContext;
import com.swpu.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;


@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //判断是否安全访问
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
          "/employee/login",
          "/employee/logout",
          "/backend/**",
          "/front/**",
          "/common/**",
          "/user/sendMsg",
          "/user/login",
          "/doc.html",
          "/webjars/**",
          "/swagger-resources",
          "/v2/api-docs"
        };
        boolean checkRes = check(urls,requestURI);

        //判断结果处理
        if (checkRes){
            filterChain.doFilter(request,response);
            return;
        }

        //网页端
        if (request.getSession().getAttribute("employee") != null){
            //将该用户id设置进线程信息
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //移动端
        if (request.getSession().getAttribute("user") != null){
            //将该用户id设置进线程信息
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));
        return;
    }

    public boolean check(String[] urls, String requestURI){
        for (String url : urls) {
            boolean checkMath = PATH_MATCHER.match(url,requestURI);
            if (checkMath){
                return true;
            }
        }
        return false;
    }
}
